[PATCH 0/6] Maintain the relative size of fs.file-max and fs.nr_open

[Jinliang Zheng]

According to Documentation/admin-guide/sysctl/fs.rst, fs.nr_open and
fs.file-max represent the number of file-handles that can be opened
by each process and the entire system, respectively.

Therefore, it's necessary to maintain a relative size between them,
meaning we should ensure that files_stat.max_files is not less than
sysctl_nr_open.

However, this point is overlooked in the current kernel code, and
this patchset aims to rectify this. Additionally, patch 0001 fixes
the type issue with the sysctl_nr_open handler.

Jinliang Zheng (6):
  fs: fix proc_handler for sysctl_nr_open
  fs: make files_stat globally visible
  sysctl: refactor __do_proc_doulongvec_minmax()
  sysctl: ensure files_stat.max_files is not less than sysctl_nr_open
  sysctl: ensure sysctl_nr_open is not greater than files_stat.max_files
  fs: synchronize the access of fs.file-max and fs.nr_open

 fs/file_table.c        | 15 ++++++++---
 include/linux/fs.h     |  2 ++
 include/linux/sysctl.h |  4 +++
 kernel/sysctl.c        | 59 ++++++++++++++++++++++++++++++++++++++----
 4 files changed, 71 insertions(+), 9 deletions(-)

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2.41.1